JP7293374B2 - Method and apparatus for determining sidelink transmit power in NR V2X - Google Patents

Description

The present disclosure relates to wireless communication systems.

Sidelink (SL) is a direct link between terminals (User Equipment, UE), and exchanges voice or data directly between terminals without going through a base station (Base Station, BS). means a communication method that SL is being considered as one solution that can solve the burden on base stations due to rapidly increasing data traffic.

V2X (vehicle-to-everything) is a communication technology that exchanges information with other vehicles, pedestrians, infrastructure-built objects, etc. through wire/wireless communication. V2X is divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian) can be done. V2X communication can be provided via the PC5 interface and/or the Uu interface.

On the other hand, as more communication devices demand greater communication capacity, there is an emerging need for improved mobile broadband communication compared to existing radio access technology (RAT). Accordingly, communication systems considering reliability and latency sensitive services or terminals are discussed, and improved mobile broadband communication, Massive MTC (Machine Type Communication), URLLLC (Ultra-Reliable The next-generation wireless access technology, which takes into account the low latency communication, etc., can be called new RAT (new radio access technology) or NR (new radio). NR can also support V2X (vehicle-to-everything) communication.

FIG. 1 is a diagram for comparing and explaining V2X communication based on RAT before NR and V2X communication based on NR. The embodiment of FIG. 1 can be combined with various embodiments of the present disclosure.

In relation to V2X communication, RAT before NR provides safety services based on V2X messages such as BSM (Basic Safety Message), CAM (Cooperative Awareness Message), DENM (Decentralized Environmental Notification Message) service) The main discussion was on how to V2X messages can include location information, dynamic information, attribute information, and the like. For example, a terminal can send a periodic message type CAM and/or an event triggered message type DENM to other terminals.

For example, the CAM may include basic vehicle information such as vehicle dynamic state information such as direction and speed, vehicle static data such as dimensions, exterior lighting conditions, route breakdown, and the like. For example, the terminal can broadcast the CAM, and the latency of the CAM is less than 100 ms. For example, a terminal can generate a DENM and send it to other terminals when an unexpected situation such as a vehicle failure or an accident occurs. For example, all vehicles within transmission range of the terminal can receive the CAM and/or DENM. In this case, DENM may have higher priority than CAM.

Since then, various V2X scenarios have been presented in NR in relation to V2X communication. For example, various V2X scenarios can include vehicle platooning, advanced driving, extended sensors, remote driving, and the like.

For example, based on vehicle platooning, vehicles can dynamically form groups and move together. For example, vehicles belonging to the group may receive periodic data from the lead vehicle in order to perform platoon operations based on vehicle platooning. For example, vehicles belonging to the group can use periodic data to reduce or increase the spacing between vehicles.

For example, vehicles can be semi-automated or fully automated based on improved driving. For example, each vehicle can adjust its trajectories or maneuvers based on data acquired by local sensors of nearby vehicles and/or nearby logical entities. Also, for example, each vehicle can mutually share driving intentions with nearby vehicles.

For example, based on augmented sensors, raw or processed data acquired via local sensors, or live video data can be used to identify vehicles, logical entities, pedestrians terminals and/or V2X application servers. Thus, for example, the vehicle can perceive an environment that is better than that which can be sensed using its own sensors.

For example, based on remote driving, for a person unable to drive or a remote vehicle located in a hazardous environment, a remote driver or V2X application can operate or control said remote vehicle. For example, cloud computing based driving can be used to operate or control the remote vehicle when the route can be predicted as in public transportation. Also, for example, access to a cloud-based back-end service platform can be considered for remote driving.

On the other hand, plans to implement service requirements for various V2X scenarios such as vehicle platooning, enhanced driving, enhanced sensors, remote driving, etc. are being discussed in NR-based V2X communication.

On the other hand, in SL communication, the transmitting terminal needs to efficiently determine the SL transmission power in consideration of the path loss between the transmitting terminal and the receiving terminal.

In one embodiment, a method is provided for a first device to perform wireless communication. The method includes transmitting one or more reference signals (RS) to a second device based on a first transmit power; channel conditions measured based on the one or more RSs ( channel state) from the second device; changing the first transmission power to a second transmission power based on the information related to the channel state; and transmitting said one or more RSs to said second device based on a transmit power of 2.

In one embodiment, a first device is provided for performing wireless communication. The first device comprises: one or more memories storing commands; one or more transceivers; and one or more processors connecting the one or more memories and the one or more transceivers; including. The one or more processors execute the instructions to transmit one or more reference signals (RS) to a second device based on a first transmit power; receiving from the second device information related to a channel state measured based on the above RS; adjusting the first transmission power to a second device based on the information related to the channel state; and transmitting the one or more RSs to the second device based on the second transmission power.

The terminal can efficiently perform SL communication.

FIG. 4 is a diagram for comparing and explaining V2X communication based on RAT before NR and V2X communication based on NR; 1 illustrates the structure of an NR system, according to one embodiment of the present disclosure; FIG. 4 illustrates functional partitioning between NG-RAN and 5GC according to one embodiment of the present disclosure; FIG. 1 illustrates a radio protocol architecture, according to one embodiment of the present disclosure; 4 shows a structure of a NR radio frame according to an embodiment of the present disclosure; 4 illustrates a slot structure of an NR frame, according to one embodiment of the present disclosure; 1 illustrates an example BWP, according to one embodiment of the present disclosure. 1 illustrates a radio protocol architecture for SL communication, according to one embodiment of the present disclosure; 1 illustrates a terminal performing V2X or SL communication according to one embodiment of the present disclosure; FIG. 4 shows a procedure for a terminal to perform V2X or SL communication according to transmission mode according to an embodiment of the present disclosure; FIG. 3 illustrates three cast types according to one embodiment of the present disclosure; 1 shows a procedure for a terminal to determine transmission power according to an embodiment of the present disclosure; 1 illustrates how a first device determines transmit power according to one embodiment of the present disclosure; 1 illustrates a method for a first device to perform wireless communication according to one embodiment of the present disclosure; 1 illustrates a method for a second device to perform wireless communication according to one embodiment of the present disclosure; 1 shows a communication system 1 according to one embodiment of the disclosure. 1 illustrates a wireless device, according to one embodiment of the disclosure. 1 illustrates signal processing circuitry for a transmit signal, according to one embodiment of the disclosure. 1 illustrates a wireless device, according to one embodiment of the disclosure. 1 illustrates a mobile device, according to one embodiment of the present disclosure. 1 illustrates a vehicle or autonomous vehicle according to one embodiment of the disclosure;

As used herein, "A or B" can mean "only A," "only B," or "both A and B." Also, in this specification, "A or B" can be construed as "A and/or B". For example, as used herein, "A, B or C (A, B or C)" means "exclusively A", "exclusively B", "exclusively C", or "any and all combinations of A, B and C ( any combination of A, B and C)".

As used herein, forward slashes (/) and commas can mean "and/or." For example, "A/B" can mean "A and/or B." Thereby, "A/B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B or C".

As used herein, "at least one of A and B" can mean "only A," "only B," or "both A and B." In addition, in this specification, the expression "at least one of A or B" or "at least one of A and/or B" means "at least can also be interpreted as "at least one of A and B".

Also, as used herein, "at least one of A, B and C" means "only A", "only B", "only C", or "A, B and Any combination of A, B and C" can be meant. Also, "at least one of A, B or C" or "at least one of A, B and/or C" It can mean "at least one of A, B and C."

Also, parentheses used herein can mean "for example." Specifically, when displayed as 'control information (PDCCH)', 'PDCCH' has been proposed as an example of 'control information'. Also, 'control information' in this specification is not limited to 'PDCCH', but 'PDDCH' is proposed as an example of 'control information'. Also, even when it is indicated as "control information (that is, PDCCH)", "PDCCH" has been proposed as an example of "control information".

In this specification, technical features individually described in one drawing can be implemented separately or simultaneously.

The following technologies are CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), etc. can be used in various wireless communication systems such as CDMA can be implemented in radio technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in radio technologies such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA is implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), etc. can be done. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd generation partnership project) LTE (long term evolution) has adopted OFDMA in the downlink and uplink as part of evolved-UMTS (evolved UMTS) using E-UTRA Adopt SC-FDMA on the link. LTE-A (advanced) is an evolution of 3GPP LTE.

5G NR is a successor technology to LTE-A and is a new clean-slate type mobile communication system with characteristics such as high performance, low delay, and high availability. 5G NR can leverage all available spectrum resources, from low frequency bands below 1 GHz to intermediate frequency bands from 1 GHz to 10 GHz to high frequency (millimeter wave) bands above 24 GHz.

For clarity of explanation, 5G NR is mainly described, but the technical idea according to an embodiment of the present disclosure is not limited thereto.

FIG. 2 shows the structure of the NR system, according to one embodiment of the present disclosure. The embodiment of FIG. 2 can be combined with various embodiments of the present disclosure.

Referring to FIG. 2, a Next Generation-Radio Access Network (NG-RAN) may include a base station 20 that provides user-plane and control-plane protocol terminations to terminals 10 . For example, the base station 20 may include a gNB (next generation-NodeB) and/or an eNB (evolved-NodeB). For example, the terminal 10 may be fixed or mobile, and may be a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), or a wireless device (wireless terminal). It is also called other terms such as Device). For example, a base station is a fixed station that communicates with the terminal 10, and is also called a BTS (Base Transceiver System), an access point, or other terms.

The example of FIG. 2 illustrates the case of including only gNBs. The base stations 20 can be connected to each other through an Xn interface. The base station 20 can be connected to a 5th generation core network (5G Core Network: 5GC) through an NG interface. More specifically, the base station 20 can be connected to an access and mobility management function (AMF) 30 through an NG-C interface, and a user plane function (UPF) 30 through an NG-U interface. can be

FIG. 3 illustrates functional partitioning between NG-RAN and 5GC, according to one embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure.

Referring to FIG. 3, the gNB performs inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control (Connection Mobility Control), radio admission control (Radio Admission Control), measurement It can provide functions such as measurement configuration & provision, dynamic resource allocation, and the like. AMF can provide features such as NAS (Non Access Stratum) security, idle mobility handling, and the like. The UPF can provide functions such as Mobility Anchoring and PDU (Protocol Data Unit) processing. The SMF (Session Management Function) can provide functions such as terminal IP (Internet Protocol) address allocation and PDU session control.

The radio interface protocol layer between the terminal and the network is L1 based on the lower three layers of the Open System Interconnection (OSI) reference model widely known in communication systems. (first layer), L2 (second layer), and L3 (third layer). Among these, the physical layer belonging to the first layer provides an information transfer service using a physical channel, and the RRC (Radio Resource Control) layer located in the third layer provides: It plays a role of controlling radio resources between the terminal and the network. To that end, the RRC layer exchanges RRC messages between the terminal and the base station.

FIG. 4 illustrates a radio protocol architecture, according to one embodiment of the present disclosure. The embodiment of FIG. 4 can be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 4 shows a radio protocol structure for a user plane, and (b) of FIG. 4 shows a radio protocol structure for a control plane. The user plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

Referring to FIG. 4, a physical layer provides information transfer services to upper layers using physical channels. The physical layer is connected to an upper layer, a medium access control (MAC) layer, through a transport channel. Data moves between the MAC layer and the physical layer via transport channels. Transport channels are classified according to how and to what characteristics data is transmitted over the air interface.

Data moves between physical layers that are different from each other, ie, between the physical layers of the transmitter and the receiver, through physical channels. The physical channel can be modulated in an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and utilizes time and frequency as radio resources.

The MAC layer provides services to an upper layer, a radio link control (RLC) layer, through logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. The MAC layer also provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC sublayer provides data transfer services on logical channels.

The RLC layer performs concatenation, segmentation, and reassembly of RLC Serving Data Units (SDUs). In order to guarantee various QoS (Quality of Service) required by a radio bearer (RB), the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledgment mode. It provides three operating modes: Acknowledged Mode (AM). AM RLC provides error correction via ARQ (automatic repeat request).

The RRC (Radio Resource Control) hierarchy is defined only in the control plane. The RRC layer is responsible for controlling logical, transport and physical channels in connection with radio bearer configuration, re-configuration and release. RB is provided by the first layer (physical layer or PHY layer) and the second layer (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer) for data transmission between the terminal and the network. means a logical path through

Functions of the PDCP layer on the user plane include user data transmission, header compression, and ciphering. Functions of the PDCP layer in the control plane include transmission and ciphering/integrity protection of control plane data.

The SDAP (Service Data Adaptation Protocol) hierarchy is defined only in the user plane. The SDAP layer performs mapping between QoS flows (flows) and data radio bearers, QoS flow identifier (ID) marking in downlink and uplink packets, etc.

Setting up an RB means a process of defining characteristics of radio protocol layers and channels and setting specific parameters and operation methods of each in order to provide a specific service. Also, RB is divided into SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

If an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal is in RRC_CONNECTED state, otherwise it is in RRC_IDLE state. In the case of NR, an RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state can maintain connection with the core network and release the connection with the base station.

Downlink transport channels for transmitting data from a network to a terminal include a BCH (Broadcast Channel) for transmitting system information and a downlink SCH (Shared Channel) for transmitting user traffic and control messages. In the case of downlink multicast or broadcast service traffic or control messages, they can be transmitted via the downlink SCH or via a separate downlink MCH (Multicast Channel). On the other hand, uplink transport channels for transmitting data from the terminal to the network include a random access channel (RACH) for transmitting initial control messages and an uplink shared channel (SCH) for transmitting user traffic and control messages. There is.

BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic Channel) and the like.

A physical channel consists of a plurality of OFDM symbols in the time domain and a plurality of sub-carriers in the frequency domain. One sub-frame is composed of a plurality of OFDM symbols in the time domain. A resource block is a resource allocation unit and is composed of a plurality of OFDM symbols and a plurality of sub-carriers. In addition, each subframe can use a specific subcarrier of a specific OFDM symbol (eg, the first OFDM symbol) of the corresponding subframe for the PDCCH (Physical Downlink Control Channel), that is, the L1/L2 control channel. can. TTI (Transmission Time Interval) is a unit time of subframe transmission.

FIG. 5 shows the structure of a NR radio frame according to one embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

Referring to FIG. 5, in NR, radio frames can be used in uplink and downlink transmissions. A radio frame has a length of 10ms and can be defined in two 5ms Half-Frames (HF). A half-frame can include five 1 ms subframes (Subframes, SF). A subframe can be divided into one or more slots, and the number of slots in the subframe can be determined by subcarrier spacing (SCS). Each slot can contain 12 or 14 OFDM(A) symbols depending on CP (cyclic prefix).

If a normal CP is used, each slot can contain 14 symbols. If extended CP is used, each slot can contain 12 symbols. Here, the symbols include OFDM symbols (or CP-OFDM symbols), SC-FDMA (Single Carrier-FDMA) symbols (or DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbols). can.

Table 1 below shows the number of symbols per slot (Nslotsymb), the number of slots per frame (Nframe, uslot), and the number of slots per subframe (Nsubframe, uslot) according to the SCS setting (u) when the normal CP is used. is exemplified.

Table 2 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS when the extended CP is used.

In the NR system, OFDM(A) numerologies (eg, SCS, CP length, etc.) can be set differently among a plurality of cells merged into one UE. Thereby, the (absolute time) intervals of time resources (e.g., subframes, slots or TTIs) (commonly referred to as TUs (Time Units) for convenience) made up of the same number of symbols are different between merged cells. can be set.

In NR, multiple numerologies or SCSs can be supported to support various 5G services. For example, if the SCS is 15 kHz, a wide area in traditional cellular bands can be supported, and if the SCS is 30 kHz/60 kHz, dense-urban, more Lower latency and wider carrier bandwidth can be supported. If the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz can be supported to overcome phase noise.

The NR frequency band can be defined into two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The numerical value of the frequency range can be changed, for example, the two types of frequency ranges are shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean 'sub 6 GHz range', FR2 can mean 'above 6 GHz range', and is called millimeter wave (mmW). can.

As mentioned above, the frequency range values of the NR system can be changed. For example, FR1 may include the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included within FR1 may include unlicensed bands. Unlicensed bands can be used in a variety of applications, for example, for communications for vehicles (eg, autonomous driving).

FIG. 6 shows a slot structure of an NR frame, according to one embodiment of the disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure.

Referring to FIG. 6, a slot includes multiple symbols in the time domain. For example, one slot can include 14 symbols for a normal CP, and one slot can include 12 symbols for an extended CP. Alternatively, one slot may include 7 symbols in case of normal CP, and 6 symbols in case of extended CP.

A carrier includes multiple sub-carriers in the frequency domain. A Resource Block (RB) can be defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. A BWP (Bandwidth Part) can be defined as a plurality of consecutive (P)RBs ((Physical) Resource Blocks) in the frequency domain, and has a numerology (e.g., SCS, CP length, etc.). can be accommodated. A carrier may contain up to N (eg, 5) BWPs. Data communication can be performed via the activated BWP. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped.

On the other hand, a wireless interface between terminals or a wireless interface between terminals and a network can be composed of L1 layer, L2 layer, and L3 layer. In various embodiments of the present disclosure, the L1 layer may refer to the physical layer. Also, for example, an L2 layer may mean at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. Also, for example, the L3 layer may mean the RRC layer.

A BWP (Bandwidth Part) and a carrier will be described below.

A BWP (Bandwidth Part) is a continuous set of PRBs (physical resource blocks) in a given numerology. PRBs can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

Using BA (Bandwidth Adaptation), the terminal's reception bandwidth and transmission bandwidth need not be as large as the cell's bandwidth, and the terminal's reception bandwidth and transmission bandwidth can be adjusted. For example, the network/base station can inform the terminal of bandwidth adjustments. For example, a terminal can receive information/configuration for bandwidth adjustments from a network/base station. In this case, the terminal can perform bandwidth adjustments based on the received information/configuration. For example, the bandwidth adjustments can include bandwidth reduction/expansion, bandwidth repositioning or bandwidth subcarrier spacing change.

For example, bandwidth can be reduced during periods of low activity to save power. For example, the bandwidth location can move in the frequency domain. For example, bandwidth locations can be moved in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth can be changed. For example, the subcarrier spacing of the bandwidth can be changed to accommodate different services. A subset of the total cell bandwidth of a cell can be referred to as a BWP (Bandwidth Part). BA can be performed by the base station/network setting a BWP in the terminal and informing the terminal of the currently active BWP among the BWPs set by the base station/network.

For example, the BWP is at least one of an active BWP, an initial BWP and/or a default BWP. For example, the terminal does not monitor the downlink radio link quality in DL BWPs other than the active DL BWP on PCell (primary cell). For example, the terminal does not receive PDCCH, PDSCH or CSI-RS (except RRM) outside the active DL BWP. For example, the terminal does not trigger CSI (Channel State Information) reporting for inactive DL BWPs. For example, the terminal does not transmit PUCCH or PUSCH outside the active UL BWP. For example, for the downlink, the initial BWP can be given as a contiguous set of RBs for the RMSI CORESET (set by PBCH). For example, for the uplink, the initial BWP can be given by the SIB for random access procedures. For example, a default BWP can be set by the upper hierarchy. For example, the initial value of the default BWP is the initial DL BWP. For energy saving, if a terminal fails to detect DCI for a certain period of time, the terminal can switch its active BWP to a default BWP.

On the other hand, BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit SL channels or SL signals on a particular BWP, and a receiving terminal can receive SL channels or SL signals on the particular BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, the terminal may receive configuration for SL BWP from the base station/network. SL BWP can be (pre)configured for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For terminals in RRC_CONNECTED mode, at least one SL BWP can be activated within a carrier.

FIG. 7 illustrates an example BWP, according to one embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure. In the example of FIG. 7, it is assumed that there are three BWPs.

Referring to FIG. 7, CRBs (common resource blocks) are carrier resource blocks numbered from one end to the other end of a carrier band. And PRBs are resource blocks numbered within each BWP. Point A may indicate a common reference point for a resource block grid.

BWP can be set by point A, offset from point A (NstartBWP) and bandwidth (NsizeBWP). For example, point A is the external reference point of the carrier's PRB to which subcarrier 0 of all numerologies (eg, all numerologies supported by the network on that carrier) is aligned. For example, the offset is the PRB spacing between point A and the lowest subcarrier for a given numerology. For example, bandwidth is the number of PRBs in a given numerology.

Hereinafter, V2X or SL communication will be described.

FIG. 8 shows a radio protocol architecture for SL communication, according to one embodiment of the present disclosure. The embodiment of FIG. 8 can be combined with various embodiments of the present disclosure. Specifically, FIG. 8(a) shows a user plane protocol stack, and FIG. 8(b) shows a control plane protocol stack.

The SL synchronization signal (Sidelink Synchronization Signal, SLSS) and synchronization information will be described below.

The SLSS is an SL-specific sequence and can include a PSSS (Primary Sidelink Synchronization Signal) and an SSSS (Secondary Sidelink Synchronization Signal). The PSSS may be referred to as S-PSS (Sidelink Primary Synchronization Signal), and the SSSS may be referred to as S-SSS (Sidelink Secondary Synchronization Signal). For example, length-127 M-sequences can be used for S-PSS, and length-127 Gold-sequences can be used for S-SSS. can be used. For example, a terminal can use S-PSS for initial signal detection and acquire synchronization. For example, the terminal can obtain fine synchronization using S-PSS and S-SSS and can detect the synchronization signal ID.

A PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel through which basic (system) information that a terminal should first know before transmitting/receiving an SL signal is transmitted. For example, basic information includes information on SLSS, duplex mode (DM), TDD UL/DL (Time Division Duplex Uplink/Downlink) configuration, information on resource pool, application type for SLSS, subframe offset , broadcast information, etc. For example, for PSBCH performance evaluation, in NR V2X, the PSBCH payload size is 56 bits including a 24-bit CRC.

S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (for example, SLSS (Synchronization Signal)/PSBCH block, hereinafter S-SSB (Sidelink-Synchronization Signal Block)). can. The S-SSB can have the same numerology (i.e., SCS and CP length) as the PSCCH (Physical Sidelink Control Channel)/PSSCH (Physical Sidelink Shared Channel) in the carrier, and the transmission bandwidth is (in advance) It is within the set SL BWP (Sidelink Bandwidth Part). For example, the bandwidth of S-SSB is 11 RB (Resource Block). For example, PSBCH spans 11 RBs. The frequency position of the S-SSB can then be (pre)configured. Therefore, the terminal does not need to perform hypothesis detection on the frequency to find the S-SSB on the carrier.

FIG. 9 illustrates a terminal performing V2X or SL communication according to one embodiment of the disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure.

Referring to FIG. 9, the term terminal in V2X or SL communication can mainly mean a user's terminal. However, when network equipment such as a base station transmits and receives signals according to a communication method between terminals, the base station can also be regarded as a kind of terminal. For example, terminal 1 is the first device 100 and terminal 2 is the second device 200 .

For example, the terminal 1 can select a resource unit corresponding to a specific resource within a resource pool, which means a collection of a series of resources. Terminal 1 can then transmit an SL signal using the resource unit. For example, a receiving terminal, terminal 2, can be configured with a resource pool in which terminal 1 can transmit a signal, and can detect the signal of terminal 1 within the resource pool.

Here, if the terminal 1 is within the connection range of the base station, the base station can inform the terminal 1 of the resource pool. On the other hand, if the terminal 1 is out of the coverage area of the base station, the other terminal can inform the resource pool, or the terminal 1 can use the preconfigured resource pool.

In general, a resource pool can consist of multiple resource units, and each terminal can select one or more resource units to use for transmission of its SL signal.

Hereinafter, resource allocation in SL will be described.

FIG. 10 illustrates a procedure for a terminal to perform V2X or SL communication according to transmission modes according to an embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, transmission modes may be referred to as modes or resource allocation modes. Hereinafter, for convenience of description, in LTE, the transmission mode can be referred to as LTE transmission mode, and in NR, the transmission mode can be referred to as NR resource allocation mode.

For example, (a) of FIG. 10 illustrates terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. FIG. Alternatively, for example, (a) of FIG. 10 illustrates terminal operation associated with NR resource allocation mode 1 . For example, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication.

For example, (b) of FIG. 10 illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. FIG. Alternatively, for example, (b) of FIG. 10 illustrates terminal operation associated with NR resource allocation mode 2. FIG.

Referring to (a) of FIG. 10, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station can schedule SL resources used by terminals for SL transmission. For example, the base station can perform resource scheduling to the terminal 1 via PDCCH (more specifically, DCI (Downlink Control Information)), and the terminal 1 performs V2X or SL communication with the terminal 2 by the resource scheduling. can be executed. For example, terminal 1 transmits SCI (Sidelink Control Information) to terminal 2 via PSCCH (Physical Sidelink Control Channel), and then transmits data based on the SCI to terminal 2 via PSSCH (Physical Sidelink Shared Channel). can.

Referring to (b) of FIG. 10 , in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal performs SL within SL resources configured by the base station/network or preset SL resources. Transmission resources can be determined. For example, the configured SL resource or pre-configured SL resource is a resource pool. For example, a terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can itself select resources within the configured resource pool to perform SL communication. For example, the terminal can perform sensing and resource (re)selection procedures and select resources by itself within the selection window. For example, the sensing can be performed on a sub-channel basis. Terminal 1, which has selected a resource in the resource pool by itself, can transmit SCI to terminal 2 via PSCCH and then transmit data based on the SCI to terminal 2 via PSSCH.

FIG. 11 illustrates three cast types according to one embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 11 shows broadcast type SL communication, (b) of FIG. 11 shows unicast type SL communication, and (c) of FIG. 11 shows group cast type SL communication. Indicates communication. For unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of groupcast type SL communication, a terminal can perform SL communication with one or more terminals in the group to which the terminal belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, and the like.

Hereinafter, power control will be described.

A method for a terminal to control its uplink transmission power may include Open Loop Power Control (OLPC) and Closed Loop Power Control (CLPC). Open-loop power control allows a terminal to estimate the downlink pathloss from the base station of the cell to which the terminal belongs, and the terminal performs power control in a manner that compensates for the pathloss. be able to. For example, according to open-loop power control, when the distance between the terminal and the base station increases and the downlink path loss increases, the terminal controls the uplink power in a manner that increases the transmission power of the uplink. can be done. According to closed-loop power control, a terminal can receive information (e.g., control signals) necessary for adjusting uplink transmit power from a base station, and the terminal can perform uplink power control based on the information received from the base station. You can control your power. That is, according to closed-loop power control, the terminal can control uplink power by direct power control commands received from the base station.

Open loop power control may be supported in SL. Specifically, when a transmitting terminal is within the coverage of a base station, the base station determines the path loss for unicast, groupcast, and broadcast transmissions based on the path loss between the transmitting terminal and the serving base station of the transmitting terminal. open loop power control can be enabled. The transmitting terminal can enable open loop power control for unicast, groupcast or broadcast transmissions once the transmitting terminal receives information/configuration to enable open loop power control from the base station. This is to mitigate interference to base station uplink reception.

Additionally, at least for unicast, the configuration can be enabled to use the path loss between the sending and receiving terminals. For example, the settings can be preconfigured for the terminal. The receiving terminal can report SL channel measurements (e.g., SL RSRP) to the transmitting terminal, and the transmitting terminal can derive pathloss estimates from the SL channel measurements reported by the receiving terminal. can be done. For example, in SL, when a transmitting terminal transmits a reference signal to a receiving terminal, the receiving terminal can measure the channel between the transmitting terminal and the receiving terminal based on the reference signal transmitted by the transmitting terminal. The receiving terminal can then transmit the SL channel measurement results to the transmitting terminal. The transmitting terminal can then estimate the SL path loss from the receiving terminal based on the SL channel measurement results. Then, the transmitting terminal can perform SL power control by compensating for the estimated path loss, and can perform SL transmission to the receiving terminal. According to open-loop power control in SL, for example, when the distance between the transmitting terminal and the receiving terminal increases and the SL path loss increases, the transmitting terminal increases the SL transmission power in a manner that increases the SL transmission power. can be controlled. The power control can be applied during SL physical channel (eg, PSCCH, PSSCH, PSFCH (Physical Sidelink Feedback Channel)) and/or SL signal transmission.

To support open-loop power control, at least for unicast, long-term measurements (ie, L3 filtering) may be supported on SL.

For example, the total SL transmit power is the same for symbols used for PSCCH and/or PSSCH transmission in a slot. For example, the maximum SL transmit power can be set or pre-configured for the transmitting terminal.

For example, for SL open-loop power control, the transmitting terminal can be set to use only the downlink pathloss (eg, the pathloss between the transmitting terminal and the base station). For example, for SL open-loop power control, the transmitting terminal can be set to use only SL pathloss (eg, the pathloss between the transmitting terminal and the receiving terminal). For example, for SL open loop power control, the transmitting terminal can be configured to use downlink path loss and SL path loss.

For example, if SL open-loop power control is set to use both downlink path loss and SL path loss, then the transmitting terminal uses the power obtained based on the downlink path loss and the SL path loss to Among the obtained powers, the minimum value can be determined as the transmission power. For example, Po and alpha values can be set separately or preset for downlink path loss and SL path loss. For example, Po is a user-specific parameter associated with average received SINR. For example, the alpha value is a weighted value for path loss.

Hereinafter, L3 filtering (layer 3 filtering) will be described.

A terminal can measure RSRP based on the reference signal. Then, the terminal can perform L1 filtering and/or L3 filtering on the RSRP. For example, the terminal may perform L3 filtering based on Table 5 on RSRP measured based on the reference signal.

Referring to Table 5, for each cell measurement quantity and each beam measurement quantity for which measurements are performed, the terminal may perform Secondly, the measured results can be filtered based on Equation 1.

For details of L3 filtering, refer to 3GPP TS 38.331 V15.4.0.

Herein, for example, a transmitting terminal may be referred to as a TX UE and a receiving terminal may be referred to as an RX UE.

Herein, for example, "RSRP" and L3 RSRP measurements may be interchanged. For example, "RSRP" and L1 RSRP measurements can be interchanged.

Here, for example, "configuration" may include the terminal receiving or previously receiving information associated with said configuration from the network via predefined signaling. For example, "definition" can include the terminal receiving or previously receiving information associated with said definition from the network via predefined signaling. For example, "definition" may include that information associated with said definition is pre-defined for the terminal. For example, the network is a base station and/or a V2X server. For example, the predefined signaling can include at least one of SIB, MAC signaling, and/or RRC signaling.

According to one embodiment of the present disclosure, a TX UE performing SL communication is configured to determine transmission power based on an SL pathloss value between said TX UE and an RX UE. can be done. For example, a TX UE may determine power for SL transmissions based on SL path loss values between the TX UE and RX UEs. For example, the TX UE is a terminal that performs unicast communication with the RX UE. For example, the TX UE is a terminal that performs groupcast communication with the RX UE. For example, a TX UE can estimate the SL path loss value between the TX UE and the RX UE based on the RSRP value reported by the RX UE.

FIG. 12 shows a procedure for a terminal to determine transmission power according to one embodiment of the present disclosure. The embodiment of FIG. 12 can be combined with various embodiments of the present disclosure.

Referring to FIG. 12, in step S1210, the TX UE can send RS (Reference Signal) to the RX UE. For example, the RS is the RS used for estimating the RSRP value. For example, the RS is the RS that the RX UE uses to estimate the RSRP value. For example, the RS is CSI-RS and/or DM-RS. For example, the DM-RS is PSSCH DM-RS and/or PSCCH DM-RS. For example, the transmit power of the RS transmitted by the TX UE can be time-varying.

At step S1220, the RX UE may estimate or obtain an RSRP value based on the RS. The RX UE can then send information related to RSRP to the TX UE. For example, the RSRP-related information may include an RSRP value measured by the RX UE based on the RS.

In step S1230, the TX UE may calculate or estimate a pathloss value between the TX UE and the RX UE. For example, a TX UE can calculate or estimate a path loss value between the TX UE and the RX UE based on the RS transmit power and the RSRP value. For example, the procedure for the TX UE to obtain the pathloss value is any one of the first case, the second case and/or the third case.

(1) First case

For example, the transmit power of RSs transmitted by the TX UE can vary over time. In this case, the TX UE can receive the L1 (layer1)-RSRP value from the RX UE. After that, the TX UE sets the RS transmission power reference value (RS_PW_REF value hereinafter) to the L1-RSRP value that compensates for the difference between the RS transmission power associated with the L1-RSRP value (reported from the RX UE). For that, L3 filtering or L3 averaging can be performed. Therefore, the TX UE can obtain or determine an averaged RSRP value based on L3 filtering. For example, the RS_PW_REF value can be preconfigured for the terminal. And finally, the TX UE can calculate or estimate the SL path loss value based on Equation 2.

(2) Second case

For example, the transmit power of RSs transmitted by the TX UE can vary over time. In this case, the RX UE can obtain the RSRP value based on the RS sent by the TX UE, and the RX UE can perform L3 filtering or L3 averaging on said RSRP value. Thereafter, the TX UE can receive the averaged RSRP value from the RX UE based on L3 filtering. The TX UE then obtains or determines a UP_L3 RSRP value that compensates for the difference between the RS_PW_REF value and the RS transmit power associated with the L3 filtered or L3 averaged RSRP value (reported from the RX UE). be able to. And finally, the TX UE can calculate or estimate the SL path loss value based on Equation 3.

(3) Third case

For example, the transmit power of RSs transmitted by the TX UE can vary over time. In this case, the RX UE can obtain the RSRP value based on the RS sent by the TX UE, and the RX UE can perform L3 filtering or L3 averaging on said RSRP value. Thereafter, the TX UE can receive the averaged RSRP value from the RX UE based on L3 filtering. The TX UE can then calculate or estimate the SL path loss value via the difference between the RS_PW_REF value and the L3 filtered or L3 averaged RSRP value (reported from the RX UE). For example, finally the TX UE can calculate or estimate the SL path loss value based on Equation 4.

In the various embodiments detailed, for example, the RS_PW_REF value is the average transmit power value that the TX UE used when transmitting one or more RSs within a pre-configured (previous) time window. For example, the RS_PW_REF value is a weighted average value of transmit power values used when the TX UE transmits one or more RSs within a preset (previous) time window. For example, the RS_PW_REF value is the maximum transmission power value used when the TX UE transmits one or more RSs within a preset (previous) time window. For example, the RS_PW_REF value is the minimum transmission power value used when the TX UE transmits one or more RSs within a preset (previous) time window.

For example, the RS_PW_REF value is the transmit power value used when transmitting one or more RSs within a preset time window before the TX UE receives the (L3 or L1) RSRP value from the RX UE. Average value. For example, the RS_PW_REF value is the transmit power value used when transmitting one or more RSs within a preset time window before the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the average value of the weighted values. For example, the RS_PW_REF value is the transmit power value used when transmitting one or more RSs within a preset time window before the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the maximum value. For example, the RS_PW_REF value is the transmit power value used when transmitting one or more RSs within a preset time window before the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the minimum value.

For example, the RS_PW_REF value may be one or more RSs within a preset time window at a time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the average transmission power value used when transmitting For example, the RS_PW_REF value may be one or more RSs within a preset time window at a time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the average weighted value of transmission power values used when transmitting For example, the RS_PW_REF value may be one or more RSs within a preset time window at a time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the maximum value among the transmission power values used when transmitting For example, the RS_PW_REF value may be one or more RSs within a preset time window at a time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the minimum value among the transmission power values used when transmitting

In the various embodiments detailed, for example, the RS_PW_REF value is the average transmit power value that the TX UE has used when transmitting a (previously) preset number of times and/or a preset number of RSs. value. For example, the RS_PW_REF value is a weighted average value of transmission power values used when the TX UE (previously) transmits a preset number of times and/or a preset number of RSs. For example, the RS_PW_REF value is the maximum transmission power value used when the TX UE (previously) transmits a preset number of times and/or a preset number of RSs. For example, the RS_PW_REF value is the minimum transmission power value used when the TX UE (previously) transmits a preset number of times and/or a preset number of RSs.

For example, the RS_PW_REF value is a preset number of times and/or a preset number of RS transmissions at the nearest time before the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the average value of the transmission power values used at that time. For example, the RS_PW_REF value is a preset number of times and/or a preset number of RS transmissions at the nearest time before the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the average value of the weighted values of the transmission power values used at the time. For example, the RS_PW_REF value is a preset number of times and/or a preset number of RS transmissions at the nearest time before the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the maximum value among the transmission power values used at that time. For example, the RS_PW_REF value is a preset number of times and/or a preset number of RS transmissions at the nearest time before the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the minimum value among the transmission power values used at that time. For example, the preset number of times and/or the preset number is one.

For example, the RS_PW_REF value is a preset number of times and/or preset at the nearest time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. is the average value of transmission power values used when transmitting the specified number of RSs. For example, the RS_PW_REF value is a preset number of times and/or preset at the nearest time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the average weighted value of transmission power values used when transmitting the specified number of RSs. For example, the RS_PW_REF value is a preset number of times and/or preset at the nearest time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the maximum value among the transmission power values used when transmitting the specified number of RSs. For example, the RS_PW_REF value is a preset number of times and/or preset at the nearest time before a preset offset value from the time the TX UE receives the (L3 or L1) RSRP value from the RX UE. It is the minimum value among the transmission power values used when transmitting the specified number of RSs.

For example, if the TX UE calculates or derives the RS_PW_REF value, for example, if the TX UE calculates or derives the (weighted) average value of the transmit power values of multiple RSs, the TX UE will determine whether the RX UE is L3 filtered. Or it can be set to use or apply (also) the coefficients used in L3 averaging. For example, the coefficient is the coefficient that the RX UE uses when calculating or deriving the L3 filtered or L3 averaged RSRP. For example, when the RX UE calculates or derives the L3-filtered or L3-averaged RSRP based on Equation 1, the TX UE uses the same coefficient (eg, a) to calculate the transmit power of multiple RSs A (weighted) average of the values can be calculated or derived.

For example, if the TX UE calculates or derives the RS_PW_REF value, the TX UE can be configured to (also) use or apply the time window information that the RX UE uses in L3 filtering or L3 averaging. For example, when the TX UE calculates or derives the RS_PW_REF value, the TX UE determines the number of samples (e.g., RS transmit power values to which (weighted) averaging is applied) that the RX UE uses in L3 filtering or L3 averaging. Can be configured to use or apply information (also). For example, the sample number information is maximum sample number information or minimum sample number information.

For example, if the TX UE calculates or derives the RS_PW_REF value, the TX UE uses pre-configured (independently or newly) coefficients for L3 filtering or L3 averaging to calculate or derive the RS_PW_REF value. can be set to For example, if the TX UE calculates or derives the RS_PW_REF value, the TX UE uses the pre-configured (independently or newly) time window information for L3 filtering or L3 averaging to calculate the RS_PW_REF value. or can be set to derive. For example, if the TX UE calculates or derives the RS_PW_REF value, the TX UE uses the preset (independently or newly) sample number information for L3 filtering or L3 averaging to calculate the RS_PW_REF value. or can be set to derive. For example, the sample number information is maximum sample number information or minimum sample number information.

For example, the coefficients associated with L3 filtering or L3 averaging are dependent on at least one of service type, service priority, service requirements, service-related QoS, cast type and/or congestion level. can be set differently or independently for the terminal. For example, the time window for L3 filtering or L3 averaging may be based on at least one of service type, service priority, service requirement, service-related QoS, cast type and/or congestion level. It can be set differently or independently for the terminal accordingly. For example, the number of samples to which L3 filtering or L3 averaging is applied (e.g., the minimum number of samples or the maximum number of samples), the type of service, the priority of the service, the requirements of the service, the QoS associated with the service, the cast type, and the /or can be configured differently or independently for terminals depending on at least one of the congestion levels.

For example, if the TX UE uses pre-configured (independently or newly) coefficients or information to calculate or determine the RS_PW_REF value, the TX UE uses for (weighted) averaging of the RS transmit power ( Averaging) time window length can be set to a relatively smaller value for the TX UE than the time window length that the RX UE uses for L3 filtering or L3 averaging. For example, if the TX UE uses pre-configured (independently or newly) coefficients or information to calculate or determine the RS_PW_REF value, the TX UE uses for (weighted) averaging of the RS transmit power ( Averaging) time window length can be set to a relatively larger value for the TX UE than the time window length that the RX UE uses for L3 filtering or L3 averaging.

For example, if the TX UE uses pre-configured (independently or newly) coefficients or information to calculate or determine the RS_PW_REF value, the samples that the TX UE uses for (weighted) averaging of the RS transmit power The number can be set for the TX UE to a relatively smaller value than the number of samples that the RX UE uses for L3 filtering or L3 averaging. For example, if the TX UE uses pre-configured (independently or newly) coefficients or information to calculate or determine the RS_PW_REF value, the samples that the TX UE uses for (weighted) averaging of the RS transmit power The number can be set for the TX UE to a relatively larger value than the number of samples that the RX UE uses for L3 filtering or L3 averaging. For example, the number of samples is the maximum number of samples. For example, the number of samples is the minimum number of samples.

For example, if the TX UE uses pre-configured (independently or newly) coefficients or information to calculate or determine the RS_PW_REF value, the TX UE uses for (weighted) averaging of the RS transmit power ( The (averaging) factor can be set for the TX UE to a relatively smaller value than the (averaging) factor that the RX UE uses for L3 filtering or L3 averaging. For example, if the TX UE uses pre-configured (independently or newly) coefficients or information to calculate or determine the RS_PW_REF value, the TX UE uses for (weighted) averaging of the RS transmit power ( The (averaging) factor can be set for the TX UE to a relatively larger value than the (averaging) factor that the RX UE uses for L3 filtering or L3 averaging.

For example, if the TX UE calculates or derives the RS_PW_REF value (described above), the TX UE falls within a preconfigured time window prior to receiving the (L3 or L1) RSRP value from the RX UE. The transmission power value of the RS can be considered or used. For example, the TX UE may calculate or determine the RS_PW_REF value based on the transmit power values of the RSs included within a pre-configured time window prior to receiving the (L3 or L1) RSRP value from the RX UE. can be done.

For example, if the TX UE calculates or derives the RS_PW_REF value (as described above), the TX UE will preconfigure the (L3 or L1) RSRP value before a preconfigured offset value from the time it receives the RSRP value from the RX UE. can consider or use the transmit power values of the RSs that fall within the specified time window. For example, the TX UE may, based on the RS transmit power value contained within a pre-configured time window prior to a pre-configured offset value from the time the (L3 or L1) RSRP value is received from the RX UE, An RS_PW_REF value can be calculated or determined.

For example, if the TX UE calculates or derives the RS_PW_REF value (described above), the TX UE may perform a preset number and/or number of The transmission power value of the RS can be considered or used. For example, the TX UE may calculate or determine the RS_PW_REF value based on a preset number and/or number of RS transmission power values prior to receiving the (L3 or L1) RSRP value from the RX UE. can be done.

For example, if the TX UE calculates or derives the RS_PW_REF value (described above), the TX UE pre-configures the (L3 or L1) RSRP value a pre-configured offset value before it is received from the RX UE. It is possible to consider or use the transmission power values of the number and/or number of RSs. For example, the TX UE may receive the (L3 or L1) RSRP value from the RX UE based on a preset number and/or number of RS transmission power values before a preset offset value, An RS_PW_REF value can be calculated or determined.

For example, for the second case and/or the third case, the TX UE may indicate the coefficients associated with L3 filtering or L3 averaging that the RX UE uses, the time window in which the RX UE performs L3 filtering or L3 averaging and/or sample (eg, RS) number information that the RX UE uses for L3 filtering or L3 averaging. For example, the time window information may include at least one of the length of the time window, the start time of the time window, and/or the end time of the time window. For example, the sample number information may include maximum sample number information and/or minimum sample number information. For example, the TX UE can, via predefined signaling, the coefficients associated with the L3 filtering or L3 averaging that the RX UE uses, the time window information in which the RX UE performs L3 filtering or L3 averaging, and/or Alternatively, the RX UE can receive at least one of sample (eg, RS) number information used for L3 filtering or L3 averaging. For example, the predefined signaling is PC5 RRC signaling between TX UE and RX UE. For example, predefined signaling is the (pre-)configuration that the network sends to the TX UE (eg SIB, RRC signaling).

For example, for the second and/or third case, the coefficients associated with L3 filtering or L3 averaging used by the TX UE and RX UE, the TX UE and RX UE performing L3 filtering or L3 averaging the length of the time window, the start point of the time window in which the TX UE and RX UE perform L3 filtering or L3 averaging, the end point of the time window in which the TX UE and RX UE perform L3 filtering or L3 averaging, and/or Alternatively, the TX UE and the RX UE use the same number of samples for L3 filtering or L3 averaging. For example, the number of samples is the maximum number of samples and/or the minimum number of samples.

For example, coefficients associated with L3 filtering or L3 averaging can be set for terminals in a carrier-specific or pool-specific manner. For example, the time window in which L3 filtering or L3 averaging is performed (eg, the length of the time window, the start of the time window, and/or the end of the time window) can be carrier-specifically or pool-specifically terminal can be set for For example, coefficients associated with L3 filtering or L3 averaging can be set for terminals in a carrier-specific or pool-specific manner. For example, the number of samples to which L3 filtering or L3 averaging is applied (eg, the maximum number of samples and/or the minimum number of samples) can be configured carrier-specifically or pool-specifically for the terminal.

In step S1240, the TX UE may determine transmit power based on path loss. The TX UE can then use the transmit power value to perform SL transmissions.

On the other hand, the TX UE may not be able to efficiently or successfully determine transmit power based on SL path loss. Therefore, when a TX UE cannot efficiently or successfully determine transmit power based on SL path loss, a method is needed to handle this.

For example, the TX UE can be configured to change or update the RS_PW_REF value only after the TX UE receives the RSRP value from the RX UE. For example, the TX UE can change or update the RS_PW_REF value only after the TX UE receives (L3 or L1) RSRP values from the RX UE for a preset number of times (eg, 1). For example, the TX UE can change or update the RS_PW_REF value only after the TX UE receives the (L3 or L1) RSRP value from the RX UE within a preset time window.

For example, the TX UE can be configured to change or update the transmit power value of the RS only after the TX UE receives the RSRP value from the RX UE. For example, only after the TX UE has received (L3 or L1) RSRP values from the RX UE a preconfigured number of times (e.g., 1) does the TX UE (on the reserved/selected resource) (actual) RS transmit power values can be changed or updated. For example, only after the TX UE receives the (L3 or L1) RSRP value from the RX UE within a pre-configured time window, the TX UE will receive the (actual) RS transmit power (on the reserved/selected resource) Values can be changed or updated.

For example, the TX UE can be configured to change or update the RS_PW_REF value only after a timer preconfigured for the TX UE has expired. For example, the TX UE can change or update the RS_PW_REF value only after a preconfigured timer for the TX UE expires.

For example, the TX UE can be configured to change or update the transmit power value of the RS only after a pre-configured timer for the TX UE has expired. For example, the TX UE can change or update the (actual) RS transmit power value (on the reserved/selected resource) only after a pre-configured timer for the TX UE expires.

For example, the TX UE can be configured to change or update the RS_PW_REF value only after a time window has passed. For example, the TX UE can change or update the RS_PW_REF value only after the time window has passed.

For example, the TX UE can be configured to change or update the transmit power value of the RS only after a time window has passed. For example, the TX UE can change or update the (actual) RS transmit power value (on the reserved/selected resource) only after the time window has passed.

For example, if at least one of the following conditions is met, the TX UE can fall back to a predefined transmission power determination scheme. For example, if at least one of the following conditions is satisfied, the TX UE may determine transmission power based on a predefined transmission power determination scheme, and the TX UE determines the transmission power SL transmission can be performed based on

- if the TX UE determines that the RSRP value received from the RX UE is not available; and/or

- if the TX UE determines that the RSRP value received from the RX UE is not valid; and/or

- If the TX UE cannot (successfully) receive the RSRP value from the RX UE, e.g., the TX UE has (successfully) received the RSRP value from the RX UE more than a preset critical number of times. and/or

- If the accuracy of the RSRP value reported by the RX UE to the TX UE does not meet a preset reference value, e.g. and/or

- if the SL link quality between the TX UE and the RX UE drops below a preset threshold or criterion, and/or

- if the accuracy of the SL measurement received from the RX UE degrades below a pre-configured threshold or criterion, and/or

- if RLF is generated or declared between the TX UE and the RX UE; and/or

- if the RX UE is out of the communication range of the TX UE, and/or

- if Qout is reported or declared, e.g. because the hypothetical error rate (of the control channel) calculated in the pre-defined RS in the RLM is lower than a pre-defined threshold, the link and/or if Qout is declared for

- If the PC5 RRC connection between the TX UE and the RX UE is interrupted or re-established, e.g. the session (e.g. unicast session or groupcast session) between the TX UE and the RX UE is interrupted or re-established. if;

For example, a predefined transmit power determination scheme may include a scheme in which a TX UE performs SL transmissions at its maximum transmit power value. For example, a predefined transmit power determination scheme allows the TX UE to determine transmit power based on a transmit power determination formula for a preconfigured communication type (e.g., broadcast), and transmit SL with the determined transmit power value. It can include the manner in which the transmission is performed. For example, a pre-defined transmit power determination scheme is such that the TX UE determines OLPC (Open-Loop Power Control) related parameters (e.g., Po, alpha value) (excluding SL path loss), (scheduled) RB It can include a method of determining transmit power based on a parameter such as number and performing SL transmission at the determined transmit power value. For example, a predefined transmit power determination scheme is such that after a TX UE estimates the SL path loss based on the RS transmitted by the RX UE, the transmit power is determined based on the SL path loss, and the determined A scheme for performing SL transmissions at transmit power values may be included. In this case, it is assumed that the TX UE knows the transmit power value of the RS transmitted by the RX UE. For example, the TX UE can receive information related to the transmit power value of the RS transmitted by the RX UE via predefined signaling.

According to various embodiments of the present disclosure, a TX UE can efficiently determine SL transmit power based on pathloss values between the TX UE and RX UE. Moreover, if the TX UE cannot determine the SL transmit power based on the path loss value, the TX UE can efficiently determine the SL transmit power according to other schemes.

FIG. 13 illustrates how a first device determines transmit power according to one embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

Referring to FIG. 13, in step S1310, the first device may determine/calculate/obtain the SL transmit power value. For example, the SL transmit power value can be determined/calculated/obtained based on the SL path loss between the first device and the second device. For example, the first device can determine/calculate/obtain SL transmit power values according to various embodiments of the present disclosure.

In step S1320, the first device may perform sidelink transmission based on the SL transmit power value.

Additionally, the first device can perform synchronization with the synchronization source and perform the operations described above based on the synchronization. Additionally, the first device can configure one or more BWPs and perform the operations described above on said one or more BWPs.

The proposed method can be applied to the devices described below. First, the processor 102 of the first device 100 can determine/calculate/obtain the SL transmit power value. The processor 102 of the first device 100 can then control the transceiver 106 to perform sidelink transmission based on the SL transmit power value.

FIG. 14 illustrates how a first device performs wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

Referring to FIG. 14, in step S1410, the first device can transmit one or more reference signals (RS) to the second device based on a first transmit power.

In step S1420, the first device may receive information related to the measured channel state based on the one or more RSs from the second device.

In step S1430, the first device may change the first transmission power to a second transmission power based on information related to the channel condition.

In step S1440, the first device can transmit the one or more RSs to the second device based on the second transmission power.

For example, the first transmit power can be changed to the second transmit power based on the first device determining that the information related to the channel condition is not valid. For example, the first transmission power may be changed to the second transmission power based on the first device not receiving information related to the channel state more than a critical number of times. For example, the first transmission power can be changed to the second transmission power based on the accuracy of information related to the channel state not meeting a preset criterion. For example, the first transmit power is changed to the second transmit power based on link quality between the first device and the second device not meeting a preset criterion. can be

For example, a first device may not be able to receive information from the second device related to channel state measured based on the one or more RSs. For example, the inability of a first device to receive information related to channel conditions from said second device before a unicast session is established between the first and second devices. There is For example, if the number of RSs transmitted by the first device is less than the number of RSs required for the second device to measure channel conditions (eg, the minimum number of RSs), the second device It may not be possible to measure channel conditions based on the RS transmitted by one device, whereby the first device may receive information related to said channel conditions from said second device. Sometimes I can't. For example, if a first device cannot receive information related to channel state measured based on the one or more RSs from the second device, the first transmit power is , to the second transmission power.

For example, the second transmission power is the maximum transmission power of the first device. For example, the second transmission power is determined based on at least one of an OLPC (open loop power control) related parameter or the number of RBs (resource blocks) allocated to the first device. and the pathloss between the first device and the second device is not used in determining the second transmit power.

Additionally, the first device can obtain the path loss between the first device and the second device based on one or more RSs sent by the second device. can. In this case, the second transmit power can be determined based on the path loss.

For example, the first transmission power is the maximum transmission power of the first device. In this case, the first device additionally obtains a path loss between the first device and the second device based on information related to the first transmission power and the channel state. can do. In this case, for example, the first transmission power can be changed to the second transmission power based on the path loss.

For example, the first transmit power can be time-varying. In this case, the first device may additionally determine a reference transmit power for said first transmit power. For example, an L3 filter coefficient value (layer-3 filter coefficient value) used by the first device to determine the reference transmission power is used by the second device to obtain information related to the channel state. It is the same as the L3 filter coefficient value to be used. Additionally, the first device can obtain the path loss between the first device and the second device based on the information related to the reference transmit power and the channel condition. In this case, for example, the first transmission power can be changed to the second transmission power based on the path loss.

The proposed method can be applied to the devices described below. First, the processor 102 of the first device 100 controls the transceiver 106 to transmit one or more reference signals (RS) to the second device 200 based on a first transmit power. be able to. The processor 102 of the first device 100 then directs the transceiver 106 to receive from the second device 200 information related to the measured channel state based on the one or more RSs. can be controlled. The processor 102 of the first device 100 can then change the first transmission power to a second transmission power based on information related to the channel conditions. The processor 102 of the first device 100 can then control the transceiver 106 to transmit the one or more RSs to the second device 200 based on the second transmit power.

According to one embodiment of the present disclosure, a first device for performing wireless communication can be provided. For example, the first device may include: one or more memories storing commands; one or more transceivers; and one or more processors connecting the one or more memories and the one or more transceivers. ; can be included. For example, the one or more processors execute the instructions and transmit one or more reference signals (RS) to a second device based on a first transmit power; receive from the second device information associated with a channel state measured based on the RS; and reduce the first transmit power to a second device based on the information associated with the channel state; and transmit the one or more RSs to the second device based on the second transmit power.

According to one embodiment of the present disclosure, an apparatus configured to control a first terminal can be provided. For example, the apparatus may include one or more processors; and one or more memories operably coupled to the one or more processors and storing instructions. For example, the one or more processors execute the instructions and transmit one or more reference signals (RS) to a second terminal based on a first transmit power; receive from the second terminal information associated with a channel state measured based on the above RS; and reduce the first transmission power to a second terminal based on the information associated with the channel state and transmit the one or more RSs to the second terminal based on the second transmit power.

According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium recording commands can be provided. For example, the instructions, when executed by one or more processors, may be: to the one or more processors: by a first device, one or more RSs based on a first transmit power ( transmitting information related to the channel state measured based on the one or more RSs by the first device to the second device; by the first device to change the first transmission power to a second transmission power based on information related to the channel state; and the first A device may be arranged to transmit the one or more RSs to the second device based on the second transmission power.

FIG. 15 illustrates how a second device performs wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

Referring to FIG. 15, in step S1510, the first device can transmit a reference signal (RS) to the second device based on a first transmit power.

At step S1520, the first device may transmit the RS to the second device based on a second transmission power.

In step S1530, the first device may determine a reference transmit power based on the first transmit power and the second transmit power. For example, the reference transmission power can be determined based on an L3 filter coefficient value (layer-3 filter coefficient value).

For example, the L3 filter coefficient value used by the first device to determine the reference transmit power is the L3 filter used by the second device to obtain information related to channel conditions based on the RS. Same as coefficient value.

The proposed method can be applied to the devices described below. First, the processor 102 of the first device 100 can control the transceiver 106 to transmit a reference signal (RS) to the second device 200 based on a first transmit power. The processor 102 of the first device 100 can then control the transceiver 106 to transmit the RS to the second device 200 based on a second transmit power. The processor 102 of the first device 100 can then determine a reference transmit power based on the first transmit power and the second transmit power.

According to one embodiment of the present disclosure, a first device for performing wireless communication can be provided. For example, the first device may include: one or more memories storing commands; one or more transceivers; and one or more processors connecting the one or more memories and the one or more transceivers. ; can be included. For example, the one or more processors execute the instructions and transmit a reference signal (RS) to a second device based on a first transmit power; and transmit the RS to the second device; and determine a reference transmit power based on the first transmit power and the second transmit power. For example, the reference transmission power can be determined based on an L3 filter coefficient value (layer-3 filter coefficient value).

Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

Without limitation, the various descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this document may be applied to various applications requiring wireless communication/linkage (e.g., 5G) between devices. can be applied to various fields.

Hereinafter, more specific examples will be given with reference to the drawings. In the following drawings/description, the same drawing numbers can illustrate the same or corresponding hardware blocks, software blocks or functional blocks, unless stated otherwise.

FIG. 16 shows a communication system 1 according to one embodiment of the disclosure.

Referring to FIG. 16, a communication system 1 to which various embodiments of this disclosure are applied includes wireless devices, base stations, and networks. Here, the wireless device means a device that performs communication using a wireless connection technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and is called communication/wireless/5G device. The wireless device is not limited to this, and includes a robot 100a, vehicles 100b-1, 100b-2, XR (eXtended Reality) device 100c, portable device (Hand-held device) 100d, home appliance 100e, IoT (Internet of Things). Thing) device 100 f , AI device/server 400 . For example, vehicles may include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of performing vehicle-to-vehicle communications, and the like. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR equipment includes AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) equipment, HMD (Head-Mounted Device), HUD (Head-Up Display) provided in a vehicle, TV, smartphone, It can be embodied in the form of computers, wearable devices, home appliances, digital signage, vehicles, robots, and the like. Portable devices can include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebooks, etc.), and the like. Appliances may include TVs, refrigerators, washing machines, and the like. IoT devices may include sensors, smart meters, and the like. For example, base stations and networks can be implemented by wireless devices, and the specific wireless device 200a can also act as a base station/network node for other wireless devices.

Wireless devices 100 a - 100 f can be coupled to network 300 via base station 200 . AI (Artificial Intelligence) technology can be applied to the wireless devices 100a-100f, and the wireless devices 100a-100f can be connected to the AI server 400 via the network 300. FIG. Network 300 may be configured using a 3G network, a 4G (eg, LTE) network, a 5G (eg, NR) network, or the like. Wireless devices 100a-100f may communicate with each other via base station 200/network 300, but may also communicate directly (eg, sidelink communication) without via the base station/network. . For example, the vehicles 100b-1 and 100b-2 are capable of direct communication (eg, V2V (Vehicle to Vehicle)/V2X (Vehicle to everything) communication). Also, IoT devices (eg, sensors) can communicate directly with other IoT devices (eg, sensors) or other wireless devices 100a-100f.

Wireless communication/coupling 150a, 150b, 150c may take place between wireless devices 100a-100f/base station 200 and base station 200/base station 200. FIG. Here, wireless communication/connection may be various such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (eg, relay, Integrated Access Backhaul (IAB)). wireless communication/coupling 150a, 150b, 150c via wireless communication/coupling 150a, 150b, 150c, wireless device and base station/wireless device, base station to base station For example, the wireless communication/coupling 150a, 150b, 150c can transmit/receive signals over a variety of physical channels, so based on the various suggestions of this disclosure: Among various configuration information setting processes for transmitting/receiving radio signals, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation processes, etc. At least a portion can be implemented.

FIG. 17 illustrates a wireless device according to one embodiment of the disclosure.

Referring to FIG. 17, the first wireless device 100 and the second wireless device 200 can transmit and receive wireless signals through various wireless access technologies (eg, LTE, NR). Here, {first wireless device 100, second wireless device 200} can correspond to {wireless device 100x, base station 200} and/or {wireless device 100x, wireless device 100x} in FIG. .

The first wireless device 100 includes one or more processors 102 and one or more memories 104 and may additionally include one or more transceivers 106 and/or one or more antennas 108 . Processor 102 may be configured to control memory 104 and/or transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein. For example, processor 102 can process the information in memory 104 to generate first information/signals and then transmit a wireless signal containing the first information/signals via transceiver 106 . Also, after processor 102 receives a wireless signal containing the second information/signal via transceiver 106, processor 102 can store in memory 104 information obtained from signal processing of the second information/signal. The memory 104 can be connected to the processor 102 and can store various information related to the operation of the processor 102 . For example, memory 104 may contain instructions for executing some or all of the processes controlled by processor 102 or for executing the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein. can store software code including Here, processor 102 and memory 104 are part of a communication modem/circuit/chip designed to implement wireless communication technologies (eg, LTE, NR). A transceiver 106 can be coupled to the processor 102 and can transmit and/or receive wireless signals via one or more antennas 108 . Transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 can be mixed with an RF (Radio Frequency) unit. In this disclosure, wireless device can also mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 , one or more memories 204 , and may additionally include one or more transceivers 206 and/or one or more antennas 208 . Processor 202 may be configured to control memory 204 and/or transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein. For example, processor 202 can process the information in memory 204 to generate third information/signals and then transmit a wireless signal containing the third information/signals via transceiver 206 . Also, after processor 202 receives a wireless signal containing the fourth information/signal via transceiver 206, processor 202 can store in memory 204 information obtained from signal processing of the fourth information/signal. A memory 204 can be connected to the processor 202 and can store various information related to the operation of the processor 202 . For example, memory 204 may contain instructions for executing some or all of the processes controlled by processor 202 or for executing the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein. can store software code including Here, processor 202 and memory 204 are part of a communication modem/circuit/chip designed to implement wireless communication technologies (eg, LTE, NR). A transceiver 206 can be coupled to the processor 202 and can transmit and/or receive wireless signals via one or more antennas 208 . Transceiver 206 can include a transmitter and/or receiver Transceiver 206 can be mixed with an RF unit. In this disclosure, wireless device can also mean a communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. Without limitation, one or more protocol layers can be implemented by one or more processors 102,202. For example, one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 may process one or more PDUs (Protocol Data Units) and/or one or more SDUs according to the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein. (Service Data Unit) can be generated. One or more of processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this document. One or more processors 102, 202 may process PDUs, SDUs, messages, control information, data or signals containing information (e.g., baseband signals) according to the functions, procedures, proposals and/or methods disclosed in this document. It can be generated and provided to one or more transceivers 106,206. One or more processors 102, 202 can receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and the descriptions, functions, procedures, suggestions, methods disclosed herein. and/or operational flow diagrams may obtain PDUs, SDUs, messages, control information, data or information.

One or more processors 102, 202 are referred to as controllers, microcontrollers, microprocessors or microcomputers. One or more of processors 102, 202 may be embodied in hardware, firmware, software, or a combination thereof. As an example, one or more ASIC (Application Specific Integrated Circuit), one or more DSP (Digital Signal Processor), one or more DSPD (Digital Signal Processing Device), one or more PLD (Programmable Logic De vice) or one One or more FPGAs (Field Programmable Gate Arrays) can be included in one or more processors 102 , 202 . Descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this document may be embodied using firmware or software, which may include modules, procedures, functions, etc. can be embodied in Descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this document may be implemented by firmware or software configured to execute in one or more processors 102, 202, or in one or more processors 102, 202. It can be stored in memory 104,204 and driven by one or more processors 102,202. Descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this document can be embodied using firmware or software in the form of code, instructions and/or sets of instructions.

One or more memories 104, 204 may be coupled to one or more processors 102, 202 and store various forms of data, signals, messages, information, programs, codes, instructions and/or instructions. be able to. One or more of memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. One or more memories 104 , 204 can be internal and/or external to one or more processors 102 , 202 . Also, one or more memories 104, 204 can be coupled to one or more processors 102, 202 via various techniques such as wired or wireless coupling.

One or more of the transceivers 106, 206 can transmit user data, control information, wireless signals/channels, etc. referred to in methods and/or operational flow diagrams herein, etc. to one or more other devices. . One or more of the transceivers 106, 206 may transmit user data, control information, etc., referred to in the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein from one or more other devices. It can receive radio signals/channels and the like. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. One or more processors 102, 202 can also control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Also, one or more of the transceivers 106, 206 can be coupled with one or more antennas 108, 208, via which one or more of the descriptions, functions, and functions disclosed herein can be implemented. It can be configured to transmit and receive user data, control information, radio signals/channels, etc., as referred to in procedures, suggestions, methods and/or operational flow diagrams. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (eg, antenna ports). One or more transceivers 106, 206 may process received wireless signals/channels to process received user data, control information, wireless signals/channels, etc. utilizing one or more processors 102, 202. etc. can be converted from RF band signals to baseband signals. One or more transceivers 106, 206 can convert user data, control information, radio signals/channels, etc. processed using one or more processors 102, 202 from baseband signals to RF band signals. To that end, one or more of the transceivers 106, 206 may include (analog) oscillators and/or filters.

FIG. 18 shows signal processing circuitry for a transmit signal, according to one embodiment of the present disclosure.

Referring to FIG. 18, the signal processing circuit 1000 can include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050 and a signal generator 1060. FIG. Without being so limited, the operations/functions of FIG. 18 may be performed by processors 102, 202 and/or transceivers 106, 206 of FIG. The hardware elements of FIG. 18 can be embodied in processors 102, 202 and/or transceivers 106, 206 of FIG. For example, blocks 1010-1060 can be implemented in processors 102, 202 of FIG. Also, blocks 1010-1050 can be implemented in the processors 102, 202 of FIG. 17, and block 1060 can be implemented in the transceivers 106, 206 of FIG.

The codeword can be converted to a radio signal through the signal processing circuit 1000 of FIG. Here, a codeword is an encoded bit sequence of an information block. Information blocks may include transport blocks (eg, UL-SCH transport blocks, DL-SCH transport blocks). Wireless signals can be transmitted over various physical channels (eg, PUSCH, PDSCH).

Specifically, a codeword can be converted into a scrambled bit sequence by a scrambler 1010 . A scrambling sequence used for scrambling is generated based on an initialization value, and the initialization value can include ID information of the wireless device. The scrambled bit sequence can be modulated into a modulated symbol sequence by modulator 1020 . The modulation scheme may include pi/2-BPSK (pi/2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), and the like. A complex modulation symbol sequence can be mapped to one or more transmission layers by layer mapper 1030 . Modulation symbols of each transmission layer can be mapped to corresponding antenna port(s) by precoder 1040 (precoding). The output z of precoder 1040 is obtained by multiplying the output y of layer mapper 1030 by the N*M precoding matrix W. where N is the number of antenna ports and M is the number of transmission layers. Here, the precoder 1040 can perform precoding after performing transform precoding (eg, DFT transform) on the complex modulation symbols. Also, precoder 1040 may perform precoding without performing transform precoding.

A resource mapper 1050 can map the modulation symbols for each antenna port to time-frequency resources. A time-frequency resource may include multiple symbols (eg, CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. A signal generator 1060 generates radio signals from the mapped modulation symbols, which can be transmitted to other devices via respective antennas. To this end, the signal generator 1060 includes an IFFT (Inverse Fast Fourier Transform) module, a CP (Cyclic Prefix) inserter, a DAC (Digital-to-Analog Converter), a frequency uplink converter, and the like. can be done.

In a wireless device, signal processing for received signals may consist of the inverse of the signal processing steps 1010-1060 of FIG. For example, a wireless device (eg, 100, 200 in FIG. 17) can receive wireless signals from the outside via an antenna port/transceiver. A received radio signal can be converted to a baseband signal via a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an ADC (analog-to-digital converter), a CP remover, and an FFT (Fast Fourier Transform) module. Thereafter, the baseband signal can be restored to codewords through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword can be restored to the original information block through decoding. Accordingly, signal processing circuitry (not shown) for received signals may include signal restorers, resource demappers, postcoders, demodulators, descramblers, and decoders.

FIG. 19 illustrates a wireless device, according to one embodiment of the disclosure. A wireless device can be embodied in various forms depending on the use-case/service (see FIG. 16).

Referring to FIG. 19, wireless devices 100 and 200 correspond to wireless devices 100 and 200 of FIG. 17 and include various elements, components, units/units, and/or modules. ). For example, wireless device 100 , 200 may include communication portion 110 , control portion 120 , memory portion 130 , and additional components 140 . The communication portion may include communication circuitry 112 and transceiver(s) 114 . For example, communication circuitry 112 may include one or more processors 102, 202 and/or one or more memories 104, 204 of FIG. For example, transceiver(s) 114 may include one or more transceivers 106, 206 and/or one or more antennas 108, 208 of FIG. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 can control electrical/mechanical operations of the wireless device based on programs/codes/instructions/information stored in the memory unit 130 . In addition, the control unit 120 transmits the information stored in the memory unit 130 to the outside (for example, another communication device) via the communication unit 110 via a wireless/wired interface, or transmits the information stored in the memory unit 130 via the communication unit 110. , information received from the outside (eg, another communication device) through a wireless/wired interface can be stored in the memory unit 130 .

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an input/output unit (I/O unit), a driving unit, and a computing unit. The wireless devices are not limited to this, and include robots (100a in FIG. 16), vehicles (100b-1 and 100b-2 in FIG. 16), XR devices (100c in FIG. 16), portable devices (100c in FIG. 100d), home appliances (100e in FIG. 16), IoT devices (100f in FIG. 16), digital broadcasting terminals, hologram devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices , climate/environment device, AI server/device (400 in FIG. 16), base station (200 in FIG. 16), network node, and the like. Wireless devices can be mobile or used in fixed locations, depending on the use-case/service.

19, the various elements, components, units/sections and/or modules within wireless devices 100, 200 may be interconnected entirely via wired interfaces or at least partially wirelessly via communication section 110. can be concatenated with For example, in the wireless devices 100 and 200, the controller 120 and the communication unit 110 are connected by wire, and the controller 120 and the first units (eg, 130 and 140) are wirelessly connected through the communication unit 110. be able to. In addition, each element, component, unit/portion, and/or module within wireless devices 100, 200 may further include one or more elements. For example, the control unit 120 can be composed of a set of one or more processors. For example, the control unit 120 may include a communication control processor, an application processor, an electronic control unit (ECU), a graphics processor, a memory control processor, and the like. As another example, the memory unit 130 may include a random access memory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flash memory, a volatile memory, and a non-volatile memory. (non-volatile memory) and/or combinations thereof.

Hereinafter, the embodiment of FIG. 19 will be described in more detail with reference to other drawings.

FIG. 20 illustrates a mobile device, according to one embodiment of the present disclosure. Portable devices can include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), portable computers (eg, notebooks, etc.). Mobile devices are called MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station) or WT (Wireless terminal).

Referring to FIG. 20, the mobile device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input/output unit 140c. The antenna section 108 can be configured as part of the communication section 110 . Blocks 110-130/140a-140c correspond to blocks 110-130/140 of FIG. 19, respectively.

The communication unit 110 can transmit and receive signals (eg, data, control signals, etc.) to and from other wireless devices and base stations. The controller 120 may control components of the mobile device 100 to perform various operations. The controller 120 may include an AP (Application Processor). The memory unit 130 may store data/parameters/programs/codes/instructions necessary for driving the mobile device 100 . In addition, the memory unit 130 may store input/output data/information. The power supply unit 140a supplies power to the mobile device 100 and may include a wired/wireless charging circuit, a battery, and the like. The interface unit 140b may support connection between the mobile device 100 and other external devices. The interface unit 140b may include various ports (eg, audio input/output port, video input/output port) for connection with external devices. The input/output unit 140c may receive or output video information/signals, audio information/signals, data, and/or information input by a user. The input/output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and/or a haptic module.

As an example, in the case of data communication, the input/output unit 140c acquires information/signals (eg, touch, text, voice, image, video) input by the user, and the acquired information/signals are stored in the memory unit 130. can be stored in The communication unit 110 can convert information/signals stored in memory into radio signals and transmit the converted radio signals directly to other radio devices or to a base station. Also, after receiving a wireless signal from another wireless device or base station, the communication unit 110 can restore the received wireless signal to the original information/signal. After being stored in the memory unit 130, the restored information/signal can be output in various forms (eg, text, voice, image, video, haptic) through the input/output unit 140c.

FIG. 21 illustrates a vehicle or autonomous vehicle according to one embodiment of the disclosure. Vehicles or autonomous vehicles may be implemented as mobile robots, vehicles, trains, manned/unmanned air vehicles (Aerial Vehicles, AV), ships, and the like.

Referring to FIG. 21, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna section 108 can be configured as part of the communication section 110 . Blocks 110/130/140a-140d correspond to blocks 110/130/140 of FIG. 19, respectively.

The communication unit 110 can transmit and receive signals (eg, data, control signals, etc.) to and from external devices such as other vehicles, base stations (eg, base stations, roadside base stations (Road Side units), etc.), and servers. can. Controller 120 may control components of the vehicle or autonomous vehicle 100 to perform various operations. The controller 120 may include an ECU (Electronic Control Unit). Drive 140a may cause the vehicle or autonomous vehicle 100 to travel on the ground. Drive 140a may include an engine, motor, powertrain, wheels, brakes, steering device, and the like. The power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100, and may include a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, and a vehicle forward motion sensor. /Reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, humidity sensors, ultrasonic sensors, illumination sensors, pedal position sensors, etc. The autonomous driving unit 140d has a technology to maintain the current lane, a technology to automatically adjust the speed such as adaptive cruise control, a technology to automatically travel along a predetermined route, and a destination when the destination is set. , technology that automatically sets a route and travels.

For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 can control the driving unit 140a so that the vehicle or the autonomous vehicle 100 moves along the autonomous driving route according to the driving plan (eg, speed/direction adjustment). During autonomous driving, the communication unit 110 can aperiodically/periodically acquire the latest traffic information data from an external server, and can acquire surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c can acquire information about the vehicle state and the surrounding environment during autonomous travel. Autonomous driving unit 140d may update the autonomous driving route and driving plan based on newly acquired data/information. The communication unit 110 may transmit information on the vehicle location, autonomous driving route, driving plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or the autonomous vehicle, and can provide the predicted traffic information data to the vehicle or the autonomous vehicle.

The claims set forth in this specification can be combined in various ways. For example, the technical features of the method claims of this specification can be combined and embodied in an apparatus, and the technical features of the device claims of this specification can be combined and embodied in a method. In addition, the technical features of the method claims and the technical features of the apparatus claims of this specification can be combined and embodied in an apparatus. Technical features can be combined and embodied in a method.

Claims (20)

A method for a first device to perform wireless communication, comprising:
Sending SCI (Sidelink Control Information) to the second device;
sending a demodulation reference signal (DMRS) to the second device;
L3 filter coefficient information (layer-3 (third layer) filter coefficient information) reference signal power for obtaining the sidelink (SL) pathloss from the transmission power L3 filtered using signal power: RSP);
receiving RSRP (reference signal received power) obtained from the DMRS from the second device;
obtaining the SL path loss by subtracting the RSRP from the RSP L3 filtered using the L3 filter coefficient information; and based on the SL path loss for Physical Sidelink Shared Channel (PSSCH) transmission. determining the power of . 2. The method of claim 1, wherein the L3 filter coefficient information used to obtain the RSRP and the RSP correspond to the same filter coefficient value. 2. The method of claim 1 , wherein the L3 filter coefficient information is used to obtain the RSRP and the RSP . 2. The method of claim 1, wherein the L3 filter coefficient information is configured on the first device via resource pool configuration. 2. The method of claim 1, further comprising: sending a PC5 RRC (Radio Resource Control) message containing information related to the L3 filter coefficient information to the second device. 2. The method of claim 1, further comprising: receiving a PC5 RRC (Radio Resource Control) message containing information associated with the L3 filter coefficient information from the second device. 3. The determining of the power for the PSSCH transmission based on the SL path loss is based on unicast communication performed between the first device and the second device. 1. The method according to 1. Determining the power for the PSSCH transmission based on the SL path loss comprises:
obtaining a downlink (DL) path loss between the first device and a base station (BS);
The power for the PSSCH transmission is
(i) a first transmit power obtained based on the SL path loss; and
(ii) a second transmit power obtained based on the DL path loss. The method of claim 1 , wherein the L3 is an RRC (radio resource control) layer . 2. The method of claim 1, wherein the transmit power is time-varying. A first device for performing wireless communication,
one or more memories for storing instructions;
one or more transceivers; and
one or more processors coupled to the one or more memories and the one or more transceivers;
the one or more processors executing the instructions;
Send SCI (Sidelink Control Information) to the second device;
sending a demodulation reference signal (DMRS) to the second device;
L3 filter coefficient information (layer-3 (third layer) filter coefficient information) reference signal power for obtaining the sidelink (SL) pathloss from the transmission power L3 filtered using signal power: RSP);
receiving RSRP (reference signal received power) obtained from the DMRS from the second device;
obtaining the SL path loss by subtracting the RSRP from the RSP L3 filtered using the L3 filter coefficient information; and based on the SL path loss, for Physical Sidelink Shared Channel (PSSCH) transmission. Determine power; first device. 12. The first apparatus of claim 11 , wherein the L3 filter coefficient information used to obtain the RSRP and the RSP correspond to the same filter coefficient value. 12. The first apparatus of claim 11, wherein the L3 filter coefficient information is used to obtain the RSRP and the RSP. 12. The first device of claim 11, wherein the L3 filter coefficient information is configured in the first device via resource pool configuration. 3. The determining of the power for the PSSCH transmission based on the SL path loss is based on unicast communication performed between the first device and the second device. 12. The first device according to 11. A processing device for controlling the first device ,
one or more processors; and
one or more memories coupled by the one or more processors and storing instructions;
the one or more processors executing the instructions;
Send SCI (Sidelink Control Information) to the second device;
sending a demodulation reference signal (DMRS) to the second device;
L3 filter coefficient information (layer-3 (third layer) filter coefficient information) reference signal power for obtaining the sidelink (SL) pathloss from the transmission power L3 filtered using signal power: RSP);
receiving RSRP (reference signal received power) obtained from the DMRS from the second device;
obtaining the SL path loss by subtracting the RSRP from the RSP L3 filtered using the L3 filter coefficient information;
determining power for PSSCH (Physical Sidelink Shared Channel) transmission based on the SL path loss; a processing unit. 17. The processing device of claim 16 , wherein the L3 filter coefficient information used to obtain the RSRP and the RSP correspond to the same filter coefficient value. 17. The processing device of claim 16, wherein the L3 filter coefficient information is used to obtain the RSRP and the RSP. 17. The processing device of claim 16, wherein said L3 filter coefficient information is configured in said first device via resource pool configuration. 17. The determining of the power for the PSSCH transmission based on the SL path loss of claim 16 is based on unicast communication performed between the first device and the second device. processing equipment.

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